Portals
From HLKitWiki
[Context: HL Kit … Basic Concepts and Terminology … Visual Building Blocks]
Portals are the finest level of control within a visual presentation. They provide access to individual fields within things and picks. Fields are hooked up to portals, thereby allowing the user to view and/or modify the contents of those fields. For example, a "label" portal could be associated with the "damage" field for a weapon, thereby allowing the contents of the field to be displayed to the user via that portal. If an "edit" portal were used instead, then the contents of the field could potentially be modified by the user.
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